From 12am to 10am on January 19th, our execution service was down. This was due to a logistical problem after recovering from a previous incident (http://coderpad.statuspage.io/incidents/jmmdmcmfkhbf). We're very sorry for the extended downtime, and are working on improving both our paging and redundancy in these areas. Synchronization of code editing during the interview was not effected.